When standing on the lofty height overlooking Lake Itasy, we looked to the north and west over a large number of strange hills. Mr. Sewell had said that in his judgment, old volcanoes were to be found in this neighbourhood: and it was clear to us as we stood on this commanding position together, that the craters were before us. One of them, named Ambóhitrondry, was of great height and width; outside it on the east was a second, nearly circular; and a third hung on to that. Beyond these to the north were two craters of moderate size, one of them double. And beyond these again numerous others. Some were hollow craters; others were cones of beautiful shape: and all were richly clothed with grass. At our second station nearer the lake we were close to a lofty crater called, Mángaháfa, and could look into it. Behind Moratsiázo was another, Isáhadimy: and to the west of this, another Támpóly, with a fine figure of a sleeping lion at the top. All these we carefully noted, and placed in our maps. The district on which they stand lies immediately west of Lake Itasy: and it struck us that the eruption of these volcanoes, by elevating the land, had barred the way of the original river, had submerged the level plain through which it flowed, and formed the Lake. The waters must have been high, until they found an outlet on the north and west in the channel of the present stream. Passing on to our next resting-place, the town of Mahatsinjo, we went under the slopes of Ambóhitrondry and crossed two lines of lava which had streamed from it in its active days. A short distance on we passed through a cutting in the lava stream: which had a depth of twenty feet. To the south of this cutting we had four grassy cones, and at their foot a small lake, Kazanga, a mile long and half a mile broad. Three streams run into it from the east and south; its outlet is on the west, where the water has cut its way through a thick bed of lava pebbles. On the following day we ascended a lofty hill, a little to the north of Mahatsinjo, named Ambóhimailála, and found that it was a lava cone. It gave us a fine prospect of the country. There were other cones and craters to the north, amongst which was Gasgea, one of the noblest in the group. And on a lower level of the land, were several others, of which, later in the day, we visited two, perfectly circular craters, with dirty greenish lakes at the bottom. On continuing our journey to the south, we passed several others. Altogether we counted forty cones and craters in this district of which we were sure. Some were of enormous size, with lofty walls, conspicuous for many miles: others were small. Many were of horse-shoe shape: a few were circular. There were numerous little lakes and bowls among them: of which the largest was Lake Kazanga, which we believe no Englishmen have seen hitherto. The country is strewn with lava. Here and there it appears in huge blocks